Cooling device for explosive-engines.



G. BRAUN.

COOLING DEVICE FOR EXPLOSIVB ENGINES.

APPLIOATION FILED MAY 9,1904.

" 914,109. Patented Mar. 2, 1909..

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G.. BRAUN COOLING DEVICE FOR EXPLOSIVE ENGINES.

APPLICATION-FILED MAY 9, 190

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COOLING DEVICE FOR EXPLOSIVE ENGINES.

APPLICATION FILED MAY 9, 190 1.

Patented Mar. 2, 1909.

3 SHEETS-SHEET 3.

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NORRIS PUER; mc um: was" "am D c GEORGES BRAUN, QF PARIS, FRANCE.

. COOLING DEVICE- FOR EXPLOSIVE-ENGINES.

Specification of Letters latent.

Patented March 2, 1909.

Application filed May 9, 1964. Serial No. 206,988.

To all whom it may concern:

Be it known that I, GEORGES BRAUN, ,of 93Quai dc Valmy, in the-city of Paris, Repubhc of France, clerk, have invented a Cooling Device for Explosive Engines, of s which the following is a full, clear, and exact gives, in each case, a regular circulation.

description.

, ThlS invention relates to means for cooling 7 the cylinders and valve boxes of ex losion engines of all kinds, but more especia ly and .with more advantages-in the case of the engines of agricultural and other locomobile is a .plan View of the same.

its.

same. 1 Fig. 3-is a.

machines and of automobile vehicles, and has for its object 'to provide a very simple, cheap and efiicient cooling device for such engines.

Figure lfof the annexed drawing is a view in elevation of an apparatus .forcarrying out the invention. Fi 2 is a plan view of the iOIlZOiltfllSBCtlOIl on line 55 of Fig. 4. Fig. 4 isv a vertical section on line 44 of Fig. 3. Fig. 5. is a detail sectional view of the cylinderon an enlarged scale. Fig 6 is a vertical section on the line 7-7 ofiFig. 8, oflanother form of apparatus for carrying out the invention. Fig. 7

' Fig. Sis a horizontal section on the line 88 of Fig. 6, and Fig. 9 .is adetail sectional view on an enlarged scale of the cylinder shown in Fig. 6.

Similar letters of refere'nce indicate corresponding partsiin allthe'figm'es. Referring to Figs- .1 to 5 of the drawing, the cylinder A and the valve box B are surrounded by two series of lateral cylindrical conduits a b, of difierent diameters and preferably arranged in quincunx form.

The cylinder A and the valve box B are enveloped in a casingQ made of sheet metal,

forming a reservoir for equalizing the pressureand 1n the interior of which 1s placed a" blower D, or any similar apparatus, which forces air into the reservoir, and keeps it stored in the said reservoir up to a pressure suflicient to give the said air a verygreat velocity of discharge. The cylinder A and the valve box B are connected by a channel an elongated in direction of the length ofthe cylinder so that the conduits will'not be separated to any great extent and this. end of the cylinder prevented from being cooled. ,Theblower D keeps the air in the reservoir, formed by the casing C, under dpressure, so that the air passes rapidly an uniformly through the conduits a b.

As the explosions take place in the u per' part of the cylinder'A, being brought a out by the igniter a, the upper part of said cylinder is the hottest, and as the upper part of the valvebox B is cooled by the passage of the intermittent current of carburetted air, the lower part of it is the hottest, because it serves for the escape of the products of combastion. Then again as the conduits l) are comparatively short the air does not remain long in the said conduits and consequently greatly facilitates the cooling of the-valve box B. The circulation of the air under pressure, from the top to the bottom in the said conduits b, has also the advantageof preventing the heating of the carbureted air before it reaches the cylinder through the inlet valve, and the expansion of this carbureted air by being heated would dimin ish the efiective weight thereof. 7

In Figs. 6, 7, Sand 9, I have shown an apparatus' which isv cheaper to manufacture, inasmuch as the number of conduits to be bored is considerably reduced. I Thediameters of the cylindrical conduits a bare, in this case equal, and, the interior of the said conduits a 6, bars of metal a b with spiral grooves are fixed. The conduits a b are,thus each divided intoa series of conduits of smaller availablepassage, the result of which is to put the air under pressure which passes through them into contact with a greater surface to be cooled, and at the same time a gyrating motion is given to the said air under pressure, which, by its centrifugal eflects, compels the molecules of the central part to reach the periphery roducing a circulation which 1s most favorab e to the exchange of temperatures;

In this form of the ap aratus the cylinder A and the valve box B ecome so to speak, as in the first form of apparatus, one and the same metallic block without break of continuity from the point of'view of conductibility. In the two forms above described, insteadof a blower a suction device may be employed.

In concluding the presentexplanation, it is well to add that, under the conditions de-.

tailed above and as diiect experiments have clearly shown, the transmission anctthc r leparture of the heat takes place with rapidlty and an apparatus of great elliciency is produced.)

If desired the cylinder may be provided with ribs (1 playing the part of Winglets which act by'radiation and by conducti bility. As shown in the detail viewiin Fig. 5,

the conduits a b may be of diameters differing 1 from each other in such a way that the conduits nearest to the inner walls of the oylinder A and of the valve box B are of greater diameter than the conduits farthest away from the said walls, the object of this being to make the currents of air of the greatest useful effect pass through the conduits corresponding to the hottest parts. must be clearly understood, on the one hand that the conduits a 1), instead of being bored right in the metal, as has been stated above, might be fitted to the outer contours of the cylinder A and of the valve box B, or formed by tubes, with longitudinal winglets on the inside, placed in the molds, before casting, to the desired number and at the desired places,

but always upon the express condition of puttlng the surfaces of connection into closemetallic contact, and, onthe other hand, that the fillings a I) might present, in section, any suitable shapes other than those indicated above, it being moreover understood that one may, in general and Without in any way changing the nature of the invention, vary at will the forms, dimensions, proportions, materials used and accessory parts, so long as these variations do not afsaid invention.

claimp 1. In a cooling devicefor explosive en- 'nes, a cylinder and valve box having their feet the really characteristic points of the odies formed with a plurality of .longitudinally extending conduits having spirally grooved'bars therein, the conduits of the cylinder opening at their upper ends into the air and the conduits of the valve box opening at their lower ends into the air, a casing surrounding the cylinder and valve box and Lastly, it

{' spaced therefrom, and an air forcing device arranged -within--the casing for forcing air g through said conduits.

2. In a cooling device for explosive engines, a cylinder and valve box having their nally extending spiral conduits,, the conduits of the cylinder opening at their upper ends box opening at their lower ends into the air, a casing surrounding the cylinder and valve into the air and the conduits of the valve,

apparatus in the casing for forcing air through the said conduits. Y

3. In a cooling device for explosive engines, a cylinder and valve box having their bodies formed with a' plurality of longitudinally extending conduits, the conduits of the box and spaced therefrom, and an air forcing bodies formed with a plurality of longitudi- 1 cylinder opening at upper ends into the air and the conduits of the valve box opening at their lower ends into the air, a casing surrounding the cylinder and valve box and spaced therefrom, and means for forcing air into the casing and through said conduits.

' 4. In a cooling device for explosive enin the casing for forcing air through the con 'duits. f

v The foregoing specification of my system of refrigeration for explosion motors of all kinds signed by me this twenty-first day of April 1904. a

GEORGES'BRAIN Vv'itnesses: i

HANSON C. Coxn, MAUR oE H. PIGNET.

gines, a cylinder and'valve box each provided with longitudinally extending conduits, one

der and valve box, and an air forcing device Y I 

